Is it possible to specify a link in a free field and have the site take into account the content in the search?

Question

WordPress

It is not convenient for me to upload and re-upload the text of an article through the WordPress admin panel, since I have hundreds of articles and I often edit them en masse. Therefore, I want to make a free field for the article, where I will simply indicate the path to the html file, in which the entire article will be. And when you go to the page of the article, this html file will simply be loaded.
Is it possible for wordpress site search to index the contents of this file?